Ximproved  safety-fuse



'UNrTEo STATES PATENT @einen ALBERT r. `ANDrnsws AND JOHN H. filmnews, or Avon. CONNECTICUT.

S'Pociea'tion forming port of I'JetiersPntent No. 515,679, dzrted December 26. 1265.

being had to the accompanying drawings, und

to the letters o reference marked thereon. Figure l represents one form. ot' our fusebody, with eportion ofthe apparatus employed ini-ts manufacture: Fig. 2-is n cross-sectionA ot' this forni of our fuse-body when completed. Fi g. 3 represents anotherform ofonrfuse-body, with a portion of the apparatus employed in Aitsr'nanut'ucture. Fig. 4 is u cross-section of this forni of our fuse-body when completed. I Fi g'. 5 represents another form of our {usc-body, .with n 'portion of the apparatus' employed in its nmnufactur Fig. is a cross-section .through tho uppnratnson the' lineSS in Fig. v 5. Fig. 7 is a. cross-section on the line 'l" '.L in' Fig. 5. Fig, is o. cross-section on theline U U in Fig. 5. Fig. 9 is a. cross-section oft-his form of our fuse-body 4when completed.

Sinrilnrletters ofreference ind icateli kc ports Ain all the drawings.

,Our invention is applicable to fuse for blast- .in g und o tlierlikepurposes, whether made specially-waterproof lby ex tra coatings or not. 'It

is cheaper and better than ordinary fuse.

The ordinary article known :is safety-fuse, used for blasting purposes, tite., incloses the' powder ,within several strands of yarn'which are wound spirnlly around it.. This, after be. ing'wound with finer yarns. to retain them in .place and properlyyarnishedfibrms the body -'oil-the fuse, and is distinct from the c overinfj'A oftape or othermuterial applied outsidethereof.

On the 27th of- Deceinber, 1864, Letters Pat;- "`ent,wer e issued vto one of u'sfJohuH. Andrews,

4for nbstitnjingpaper Vin=th1e plaee 0f tape to' ser'v'e as 'cveringsin the meniititetureet` water-Y Vprout?-fiA1 s/e, ni1d lsooiiielosihg the powder in tbe of paper or like materia-l coated with rubber or other material. In the course of the saine yea-r Letters Patent issued to I/Ie'ssrs.v

Chase and AFoy set'forth'a. construction of fuse 'l I i ir'ifwhieh' sliver was laid in a. certain 'manner on theexterioras a covering; but in thoseond 'iu `nlhfuses heretofore patented' or publicly known or used the material used to form. the

bodY of -the fuse whs in the form of yarns.

The nature of our invention consists, first,

in substituting sliver in thebody inV lieu of yarn; second, in o. combination and nrrengci finent of an' im pervions tube relatively thereto; and, third, in n. certain coveringr for the body of fuse, formed of'tref; and nnsized sliver wound spirnlly about the bod",r :ind saturated with fuse-varnish.

We use-for our-,sliver the nntwisted or very' slightly twisted bers of cotton, jute, flax, or other suitable tibi-ous material, preferring cottou.

To enable others skilled in the artfto make und use our invention` we will proceed tadescribeit by the :iid ot' the drawings :1nd the. lettersof reference marked thereon.

` Figures 1 and 2: vYVe nnss the sliverA into .nsuimble fuse-nienn't'aetnring tube, B,(sho'wn in section,) from suitable enns (not represent ed) placed around the tube., und revolve the cnns und tubes in a siuiilarrnennerto the present inode of innnuf'ecturing with `vnrns,assistl ing the sliver to rise from the cans by ineens of the feeding-rolls vC C, it' necessary., so that the unspnn ber in the forni of soft roving or sliver shall be wound spirally moundtheslender paper tube l), which contains the powder d, and'slmll completely und softly envelop' it. Wethen cross-wind the entire mass or body with tine yarn E, in the ordinary manner, as shown in Figi. l, nud subsequently'varnish it. 'lo make a more substantial article we omit the winding on of the sinnll \'arns T at this stage, und wind on other sliver, F', (see Fig..2,) ina. lsiiniler Vmann-er to'the first `corerin,g,-bi 1tA in an opposite direction, so that thel inclinf Awtion4 .of one luyerofsliier, A, to unwind is counterncted by that of the other luyer,F, `to unwind in the opposite direction. If there are three slivers A inthe tiret layer, there should be four or moreslivers F in the second layer. The whole may be wound with the small yarns E before varnishing, it desired.

Another meimsot' producing curiose is to" pass the fibers in Athe form of sliver loiigitludi vnellythrough-informel-shaped tube, H, (eee Figs. 5 to 8,) which "surroundsasiriilartubml! I, containing the powder d, the powder pass.' in g into vthe ber just 'before'. it emerges'from the tube H, `after which the whole 'i s imn1 edi'- 

